Hot Damn! These two pics are a collective cross-section of my earliest mat memories! Most likely the pic(s) were taken by Woody Woodworth at a place that will remain nameless for now. You're looking at stock Hodgman mats with recessed Roberts valves, radically modified by the likes of Woody and John Parks. These "Woody rafts" were often double-canvassed, and had small rear-mounted stablizer fins attached. As for the second pic of the sole rider, it could be one a handful of Bandel's, JP, Tracy Dier, Pandy? Too many players back then! Your provider and protector of CdM mat folklore, Okemah.